<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>

<body>
    <div id="app">
        {{10+20}}
    </div>

    <div id="app2">
        {{20+30}}
    </div>

    <div id="box">
        {{30+70}}
    </div>
    <script>
        Vue.createApp().mount('#app')
            // 支持多个挂载
        Vue.createApp().mount('#app2')
        Vue.createApp().mount('#box')
    </script>
</body>

</html>